Diabetic retinopathy is caused by damage to blood vessels of the retina. The retina is the layer of tissue at the back of the inner eye. It changes light and images that enter the eye into nerve signals that are sent to the brain.
Diabetic retinopathy is the leading cause of blindness in working-age Americans. People with type 1 diabetes and type 2 diabetes are at risk for this condition.
Having more severe diabetes for a longer period of time increases the chance of getting retinopathy. Retinopathy is also more likely to occur earlier and be more severe if your diabetes has been poorly controlled.
Almost everyone who has had diabetes for more than 30 years will show signs of diabetic retinopathy.
Symptoms
Most often, diabetic retinopathy has no symptoms until the damage to your eyes is severe.
Symptoms of diabetic retinopathy include:
Blurred vision and slow vision loss over time
Shadows or missing areas of vision
Trouble seeing at night
Many people with early diabetic retinopathy have no symptoms before major bleeding occurs in the eye. This is why everyone with diabetes should have regular eye exams.


For more information-- follow this link: http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002192/


